Is intolerance of intolerance the only way a tolerant society can thrive?

One of our listeners presented to us the paradox of tolerance as an aspect of our most recent free speech episode that we didn’t explore, so we’re dedicating a whole hard shot to it. The paradox was developed by Karl Popper in the 1940’s as arguably the greatest intolerance of the 20th century was coming to a threatening head. However, in the light of groups like antifa and the alt-right springing up seemingly all over the place, it becomes relevant again to ask how tolerant we must be of intolerance.